Operation Manual

41
■ LED ON OUTDOOR UNIT PCB
3MXS, 4MXS, 5MXS series
■ LED ON OUTDOOR UNIT PCB
2MXS series
NOTE
• Turn the power off and then on again. If the LED display recurs, the outdoor unit PCB is faulty.
• Diagnosis marked
* Do not apply to some cases. For details, refer to the service guide.
GREEN RED
MICROCOMPUTER
NORMAL
MALFUNCTION
DETECTION
LED-A LED1 LED2 LED3 LED4 LED5 DIAGNOSIS
●●●●●
NORMAL CHECK INDOOR UNIT
●●
HIGH PRESSURE PROTECTOR WORKED OR FREEZE-UP IN
OPERATING UNIT OR STAND-BY UNIT
●●●
* OVERLOAD RELAY WORKED OR HIGH DISCHARGE PIPE
TEMPERATURE
●●●
FAULTY COMPRESSOR START
●●●
INPUT OVERCURRENT
●●●
* THERMISTOR OR CT ABNORMALITY
●●
HIGH TEMPERATURE SWITCHBOX
●●● ●
HIGH TEMPERATURE AT INVERTER CIRCUIT HEATSINK
●● ●●
* OUTPUT OVERCURRENT
●● ●
* REFRIGERANT SHORTAGE
●● ●
LOW VOLTAGE TO MAIN CIRCUIT OR MOMENTARY VOLTAGE
LOSS
●●●●
REVERSING SOLENOID VALVE SWITCHING FAILURE
●
FAN MOTOR FAULT
––––
●
[NOTE 1]
●
––––
●
POWER SUPPLY FAULT OR [NOTE 2]
NOTE: The LED5 is only available in the 5M series.
GREEN NORMALLY FLASHING
RED NORMALLY OFF
ON
FLASHING
● OFF
– IRRELEVANT
GREEN
MICROCOMPUTER NORMAL
LED-A DIAGNOSIS
NORMAL CHECK INDOOR UNIT
[NOTE 1]
● POWER SUPPLY FAULT OR [NOTE 2]
GREEN NORMALLY FLASHING
ON
FLASHING
● OFF
Troubleshooting